Television system



Aug. 30, 1932. c. L. DAVIS TELEVISION SYSTEM Filed June 28, 1950 2 Sheets-Sheet l Z'lvered INVENTOR. efe/al'e/o 9 go/MA,

ATTORNEY) Aug. 30, 1932. c. L. DAVIS 1,874,171

TELEVISION SYSTEM Filed June 28, 19 50 2 Sheets-Sheet 2 EIEEi-S- I N VEN TOR. @(MXk/v $1 DMZ a,

Z BY 0. 0 ATTORNEY illustrated in Fig. 5 is employed including an antenna-ground designated at 1() 11 connected to a coupling circuit illustrated at 12 to which there is connected the radio frequency amplifier stage 14, the detector 16 and the oscillator 17. The detector 16 is coupled to the output of the radio frequency amplifier 14 throughtransformer circuit 15. The circuits of the radio frequency amplifier stage 14 and detector 16 are tuned as designated at 19 and 20 respectively. The oscillator includes variable condenser '18 connected in circuit with the inductive screen 1 and the oscillatory circuit 22. The inductive screen 1 has terminals 6 and 7 connecting the circuit of the oscillator 17. The driving motor 21 operates in synchronism with the motor 361 at the transmitter and periodically varies the capacity of condenser 18 and condensers 19 and 20 in the receiver through a suitable mechanical interlinkage designated at 24. The period of the screen 1 is therefore made to sweep a recurring frequency band and the potential node is shifted along the screen in accordance with the incoming signaling energy. The light emanating from source 2 illuminates the potential node which shifts along the inductive screen 1. The movement of the node is reproduced on screen 4 through velope 5 which contains the inductive screen I l within a cabinet structure designated at 25 andwithin which the screen is subjected to light rays from the source 2. the light being directed through optical system 3 upon the screen 4. By selecting suitable color contrast between the illuminating means 2 and the gas content in the glow discharge tube constituting the inductive screen 1, the desired intensity of reflection may be obtained upon the screen 4. The receiver has been diagrammatically illustrated in Fig. 6 as having the output of theoscillator connected to the inductive screen 1.

In Fig. 7, I have shown the inductive screen 1 disposed within a cabinet structure 5 but with the reflecting surface 8 removed from the glow discharge tube 1. A light source 40 disposed adjacent a reflector 27 is positioned at a predetermined distance behind the inductive screen 1 in order that light rays of suitable color contrast to the luminous discharge of the inductive screen 1 may be dicolor characteristic in contrast with the luminous discharge tube 1 as will permit display of the movable node along screen 4 to the best possible advantage. In the arrangement illustrated in Fig. 7, the reflector 8 is omitted from the luminous. discharge device. The receiver in Fig. 7 has been illustrated diagrammatically in a manner similar to the arrangement shown in Fig. 6 With theluminous discharge tube 1 in the output of the oscillator circuit.

The successive movement of potential nodes of different intensity due to the transmitter control producesluminous glow in the glow discharge tube 1 having different light reflective or filter properties enabling the image to be reproduced in desired proportions-upon the screen4. V

For the purposes of illustrating my invention, I have shown the television system in connection with space radio circuits but it will be understood that the principles of my invention are equally applicable to wired radio systems.

l/Vhile I have described my invention in certain preferred embodiments, I desire that it be understood that modiflcationsmay be madeand that no limitations upon my invention are intended other than are imposed by the scope of the appended claims. 7

What I claim as new and desire to secure by Letters Patent of the United States is as follows: v

1. In a television system, means for receiving electrical energy over a recurring band of frequencies, a cabinet structure, an inductive screen disposed within said cabinet structure and luminously responsive to potential varia tions in the received signaling energy, means mounted in said cabinet structure out'of the field of view of said inductive screen for directing light upon said surface, an imagereproducing screen, and an optical system centrally aligned with respect to said cabinet structure and interposed between said inductive screen and said image reproducing surface for visually reproducing the movement of potential nodes along said inductive screen.

2. In a television system, a receiving circuit responsive to signaling energy over a variable range of frequencies, an enclosing casing, a luminously responsive screen for reproducing the movement of potential node in accordance with the characteristic of the transmitted energy disposed, interiorly, of said casing adjacent one end thereof, an image reproducing surface, an optical system carried by said casingand interposed between said luminously responsive surfaceand said image reproducing screen, and means disposed in the other end of said casing out of the field of view of said optical system for illu- V minating said luminously responsive screen for reflecting the movement of a potential node thereon upon said image reproducing surface. Y

3. In a television system, a circuit for receiving television signaling energy, a cabinet structure opaque tolight, a glow discharge tube responsive to Variations in intensity of the receiving signaling energy and mounted interiorly of said cabinet structure adjacent one end thereof, an image reproducing sursive screen extending parallel to the rear Wall of said cabinet and subject to variations in glow according to variations in potential of the received signaling energy, an image re producing surface exterior to said cabinet, an optical system carried by the front wall of said cabinet centrally of said screen and interposed between said image reproducing surface and said luminously responsive screen, and means Within said cabinet adjacent the front Wall thereof and located out of the field of View of said optical system for directing light rays upon said luminously responsive screen for reproducing an image through said optical system upon said image reproducing surface.

In testimony whereof I affix my signature.

CHESTER L. DAVIS. 

